code: def __enter__(self):
      self.__feed = sqlitefeed.Feed(
          self.__dbFilePath, self.__frequency, maxLen=self.__maxLen
      )
  
file_path: pyalgotrade/testcases/dbfeed_test.py
imports: import os
  from six.moves import xrange
  from .None import common
  from .None import feed_test
  from pyalgotrade.barfeed import yahoofeed
  from pyalgotrade.barfeed import sqlitefeed
  from pyalgotrade import bar
  from pyalgotrade import marketsession
label_desc: Use image node_id 2 for calling the TemporarySQLiteFeed obj's underlying member method code with example usage: obj.__enter__() without return types